.dv-border-box {
 position: relative;
}

.border {
 position: absolute;
 display: block;
}

.left-top {
 left: 0;
 top: 0;
}

.right-top {
 top: 0;
 right: 0px;
 transform: rotateY(180deg);
}

.left-bottom {
 left: 0;
 bottom: 0;
 transform: rotateX(180deg);
}

.right-bottom {
 right: 0;
 bottom: 0;
 transform: rotateX(180deg) rotateY(180deg);
}

.content-box {
 position: relative;
 width: 100%;
 height: 100%;
}